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- phosphorus[remove]2
- pollutants[remove]2
- rivers2
- water quality[remove]2
- watersheds[remove]2
- basins1
- computer analysis1
- glacial deposits1
- governmental programs and projects1
- internal drainage1
- literature reviews1
- moraine soils1
- nitrates1
- nitrogen1
- nutrients1
- runoff1
- seasonal variation1
- sediment yield1
- slope1
- soil movement1